Vitamin D & Testosterone

Positive association between vitamin D and testosterone levels have been observed from various research studies. Randomised controlled trials (RTA) with 1,362 participants, conducted by Nimptsch et al (2013) has concluded a positive association of vitamin D with total and free testosterone levels. The association is linear at lower levels of vitamin D, reaching a plateau at high levels.

In other words, men with low vitamin D are likely to be found suffering from testosterone deficiency. In the UK, we might not get adequate sunshine throughout the whole year but Vitamin D can be found in milk, egg yolks, cheese, cod liver oil and so on. Supplementation of vitamin D is required when the level is found to be insufficient or deficient.

Dr. Chia Tan is a UK trained medical doctor that specialises in cosmetic and aesthetic medicine and testosterone replacement therapy. He is qualified as a medical doctor since 2003 and has since trained extensively. He has been featured in several leading magazines as well as invited to appear on TV to discuss aesthetic medicine and the latest cosmetic procedures.

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Dr. Tan is an absolute superstar. I'm not a fan of needles but he makes things so easy. He listens to what I'm trying to achieve and talks me through what to expect and aftercare steps.
I would highly recommend Dr. Tan.
Thank you Dr. Tan, I appreciate your skills, experience and patience with me.read more

Dr Tan is great guy.. Im a guy in his 40's and decided to have a little bit of botox around the eyes.
He did an excellent job for fair price, i only wanted a subtle change, and he did exactly that, not too much and not too little.
Highly recommendedread more

Dr Tan is clearly an expert in his field. He has a patient and caring mannerism which immediately put me at ease from the very first time. I've had Tear Trough and Non-Surgical Nose treatment and will continue to use this clinic for follow up treatments. The results have lasted well over a year. Dr Tan answers any questions confidently every time and will not give you treatments you don't require. I highly recommend Harley MD. You will not regret it and won't want to go elsewhere because the quality in service and products is second to none! Thank you Harley Street MD!read more

I’ve always had deep circles under my eyes and wanted to do something about it, after seeing the reviews I went for it and couldn’t be happier. The tear trough fillers were fairly quick and easy, if your thinking about it I recommend!read more

I have a huge fear of needles and am resistant to the regular dosage of local anaesthetic. Dr Tan is an ardent professional. He is super patient, taking the time to ensure you're happy and prepared for treatments. He's happy to administer the correct amount of anaesthetic personally needed. As a patient I felt like I mattered and that my concerns were completely understood. It's easy to see why people visit him again and again, I've been gong for over two years. He cares. It's that simple.read more

Dr Tan is an extremely friendly, polite and professional individual who has given me fantastic advice and knowledge over the period of time I have known him. He gives an incredible level of customer service and always makes me feel at ease when I'm in his company.
I would highly recommend him to anyone seeking the services that he offers.
Keep up the good work Dr Tan!read more

Dr. Tan is the best at what he does and has the perfectionist eye. He spends plenty of time on getting it right and makes sure it’s not too much or too little. Always so happy after my treatments with Dr. Tan🤗read more

Situated in Central London where time is scarce & clients appreciate flexibility
& efficiency. Harley Street Medical Doctors was established with the sole
objective to help people improve their health, well-being & confidence.